<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  {% if age > 18 %}
    <div>大于18岁</div>
  {% elif age == 18 %}
    <div>等于18岁</div>
  {% else %}
    <div>小于18岁</div>
  {% endif %}


  {% for book in books %}
    <div>{{book}}</div>
  {% endfor %}
</body>
</html>